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Name
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Candidate Number
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Centre Number
0625/02
PHYSICS
Paper 2 Core
October/November 2005
1 hour 15 minutes
Candidates answer on the Question Paper.
No Additional Materials are required.
READ THESE INSTRUCTIONS FIRST
Write your Centre number, candidate number and name on all the work you hand in.
Write in dark blue or black pen in the spaces provided on the Question Paper.
You may use a soft pencil for any diagrams, graphs or rough working.
Do not use staples, paper clips, highlighters, glue or correction fluid.
Answer all questions.
At the end of the examination, fasten all your work securely together.
The number of marks is given in brackets [ ] at the end of each question or part question.
You may lose marks if you do not show your working or if you do not use appropriate units.
Take the weight of 1 kg to be 10 N (i.e. acceleration of free fall = 10 m/s2).
For Examiner’s Use
If you have been given a label, look at the
details. If any details are incorrect or
missing, please fill in your correct details
in the space given at the top of this page.
Stick your personal label here, if
provided.
This document consists of 15 printed pages and 1 blank page.
MML 8113 3/04 S80925/2
© UCLES 2005
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
International General Certificate of Secondary Education
2
1
The length of a spring is measured when various loads from 1.0 N to 6.0 N are hanging
from it. Fig. 1.1 gives a graph of the results.
25
20
length / cm
15
10
5
0
0
1
2
3
4
5
load / N
6
Fig. 1.1
Use the graph to find
(a) the length of the spring with no load attached,
length = ......................... cm [1]
(b) the length of the spring with 4.5 N attached,
length = ......................... cm [1]
(c) the extension caused by a 4.5 N load.
extension = ................... cm [2]
© UCLES 2005
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For
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3
2
For
Examiner's
Use
Palm trees are growing every 25 m alongside the highway in a holiday resort.
1
2
3
4
IGCSE
Fig. 2.1
The IGCSE school bus drives along the highway.
(a) It takes 2 s for the bus to travel between palm tree 1 and palm tree 2.
Calculate the average speed of the bus between tree 1 and tree 2.
average speed = .......................... [4]
(b) It takes more than 2 s for the bus to travel from tree 2 to tree 3.
State what this information indicates about the speed of the bus.
.................................................................................................................................... [1]
(c) The speed of the bus continues to do what you have said in (b). State how the time
taken to go from tree 3 to tree 4 compares with the time in (b).
The time taken to travel from tree 3 to tree 4 is ............................................. the time to
travel from tree 2 to tree 3.
[1]
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4
3
(a) Fig. 3.1 shows two examples of footwear being worn by people of equal weight at a
Winter Olympics competition.
skate
ski
Fig. 3.1
Which footwear creates the greatest pressure below it, and why?
Which? .............................................................................................................................
Why? .......................................................................................................................... [2]
(b) Drivers of high-sided vehicles, like the one in Fig. 3.2, are sometimes warned not to
drive when it is very windy.
Fig. 3.2
Suggest why they receive this warning.
..........................................................................................................................................
..........................................................................................................................................
.................................................................................................................................... [2]
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5
4
For
Examiner's
Use
A man is delivering a cupboard to a house.
house
step
wheels
Fig. 4.1
(a) The man rolls the cupboard at a steady speed from the lorry to the house. The friction
force in the wheels is 40 N. State the force with which the man has to push.
force = .................... N [1]
(b) The cupboard weighs 720 N. State the smallest force needed to lift the cupboard.
force = .................... N [1]
(c) The step is 0.20 m high. Calculate the work required to lift the cupboard onto the step.
work required = ..................................... [4]
(d) The man has to ask his assistant to help him lift the cupboard onto the step. Together,
they lift it onto the step in 1.2 s. The men work equally hard.
Calculate the power developed by each man.
power developed = ................................ [4]
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5
The apparatus shown in Fig. 5.1 is set up in a laboratory during a morning science lesson.
flask
air
clamp
tube
water
Fig. 5.1
Later in the day, the room temperature is higher than in the morning.
(a) What change is observed in the apparatus?
.................................................................................................................................... [1]
(b) Explain why this change happens.
.................................................................................................................................... [1]
(c) Suggest one disadvantage of using this apparatus to measure temperature.
.................................................................................................................................... [1]
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7
6
Fig. 6.1 shows a reed relay being used to switch on an electric motor when a variable
resistor is adjusted.
M
For
Examiner's
Use
+
power
– supply
reed
relay
S
variable resistor
Fig. 6.1
(a) The variable resistor is set at its greatest resistance and then switch S is closed. The
reeds in the reed relay do not close when this is done.
(i) State two things that happen in the coil of the reed relay.
1. ..............................................................................................................................
2. ........................................................................................................................ [2]
(ii) State what happens to the two reeds in the reed relay.
............................................................................................................................ [1]
(b) The resistance of the variable resistor is slowly decreased. The reeds in the reed relay
close. Fig. 6.2(a) shows how the current in the coil changes with time.
current
in
coil
Fig. 6.2(a)
0
0
time
current
in
motor
Fig. 6.2(b)
0
0
time
On Fig. 6.2(b), draw a line that might show how the current in the motor changes with
time as the variable resistor is adjusted.
[4]
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7
For
Examiner's
Use
(a) The filament of a lamp is placed at the principal focus of a lens, as shown in Fig. 7.1.
Fig. 7.1
On Fig. 7.1, continue the three rays through the lens and out into the air on the right of
the lens.
[1]
(b) The lens in Fig. 7.2 has a focal length of 2.0 cm.
object
1 cm
1 cm
Fig. 7.2
On Fig. 7.2,
(i) mark and label the positions of the principal focus on the left of the lens and the
principal focus on the right of the lens,
[1]
(ii) carefully draw a ray from the top of the object, parallel to the axis, through the lens
and continue it until it reaches the edge of the squared area,
[1]
(iii) carefully draw a ray from the top of the object, which travels parallel to the axis
after it has passed through the lens,
[1]
(iv) draw and label the image.
© UCLES 2005
[2]
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9
8
(a) Two magnets are laid on a bench. End A of an unidentified rod is held in turn above
one end of each magnet, with the results shown in Fig. 8.1.
A
S
N
bench
For
Examiner's
Use
A
N
S
south pole
lifted off
bench
north pole
lifted off
bench
Fig. 8.1
(i) Suggest what the unidentified rod is made from.
............................................................................................................................ [1]
(ii) State what, if anything, happens when the end A is held over one end of
1.
an unmagnetised iron bar, ................................................................................
2.
an uncharged plastic rod. ........................................................................... [2]
(b) Fig. 8.2 shows four identical plotting compasses placed around a bar magnet where
the magnetic field of the surroundings can be ignored. The pointer has only been
drawn on one plotting compass.
S
N
Fig. 8.2
On Fig. 8.2, draw the pointers on the other three plotting compasses to indicate the
directions of the magnetic field of the bar magnet in those three places.
[3]
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9
(a) Fig. 9.1 shows five circuit symbols and their names. The names are in the wrong order.
Draw a straight line from each symbol to its name. One line has been drawn as an
example.
cell
V
lamp
ammeter
voltmeter
switch
A
Fig. 9.1
[3]
(b) Fig. 9.2 shows a circuit.
ammeter 1
switch
lamp 2
lamp 1
cell
1.5
V
ammeter 2
Fig. 9.2
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11
(i) In the space below, draw the circuit using circuit symbols.
[1]
For
Examiner's
Use
(ii) On your diagram in (b)(i), add a voltmeter connected to measure the potential
difference across the cell.
[1]
(iii) When the switch is pressed so that the contacts join, which of the lamps light up?
............................................................................................................................ [1]
(iv) When there is a current in the circuit, ammeter 1 reads 0.5 A.
What current does ammeter 2 read?
current = .................... A [1]
(v) One lamp “blows”, so that its filament breaks.
What happens in the circuit?
..................................................................................................................................
............................................................................................................................ [1]
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10 Some fat purchased from a shop is supplied as the block shown in Fig. 10.1.
10 cm
4 cm
6.5 cm
Fig. 10.1
Use the information in Fig. 10.1 to calculate
(a) the volume of the block,
volume = ...................... cm3 [2]
(b) the density of the fat. Give your answer to 2 significant figures.
density = ............................. [5]
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13
For
Examiner's
Use
11 Fig. 11.1 shows a tube for producing cathode rays. The tube contains various parts.
B
C
D
A
Fig. 11.1
A spot is formed on the screen by the cathode rays.
(a) What do cathode rays consist of? .............................................................................. [1]
(b) Which part, A, B, C or D, must be heated to create the cathode rays? ..................... [1]
(c)
(i) Which part, A, B, C or D, is coated with fluorescent material? ........................... [1]
(ii) What is the purpose of the fluorescent material?
............................................................................................................................ [1]
(d) A potential difference is applied between the two halves of part C.
What effect does this have on the cathode rays?
.................................................................................................................................... [1]
(e) Explain why there needs to be a vacuum inside the tube.
..........................................................................................................................................
..........................................................................................................................................
.................................................................................................................................... [2]
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For
Examiner's
Use
12 (a) State what is meant by
(i) the half-life of a radioactive substance,
..................................................................................................................................
............................................................................................................................ [3]
(ii) background radiation.
..................................................................................................................................
............................................................................................................................ [1]
(b) In a certain laboratory, the background radiation level is 25 counts/minute.
Fig. 12.1 is a graph of the count-rate measured by a detector placed a short distance
from a radioactive source in the laboratory.
80
70
count-rate
counts / min
60
50
40
30
20
10
0
0
20
40
60
80
100
time / min
Fig. 12.1
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140
15
(i) At zero time, the measured count-rate of the source and background together is
80 counts/minute.
Calculate the count-rate due to the source alone.
count-rate due to source = .................. counts/min [2]
(ii) After one half-life has elapsed, what is the count-rate
1.
due to the source alone,
count-rate due to source = ................. counts/min
2.
measured by the detector?
count-rate measured by detector = ........................ counts/min
[2]
(iii) Use the graph to find the half-life of the source.
half-life of source = ......................... min [1]
(iv) Why does the graph not drop below the 25 counts/minute line?
..................................................................................................................................
............................................................................................................................ [1]
(v) On Fig. 12.1, sketch the curve that might be obtained for a source with a shorter
half-life.
[2]
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Examiner's
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16
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0625/02/O/N/05